Now that Google has opened up VP8, the big question is obviously how it'll hold up to H264. Of course, VP8 already wins by default because it's open source and royalty free, but that doesn't mean we should neglect the quality issue. Jan Ozer from StreamingMedia.com has put up an article comparing the two codecs, and concludes that the differences are negligible - in fact, only in some high-motion videos did H264 win out. As always, this is just one comparison and most certainly anything but conclusive. Update:Another comparison. I can't spot the difference, but then again, I'm no expert.

MNG support was maliciously dropped by Mozilla because "you're face!" -- or at least that's the best argument I heard at the time. "We don't like to have a 100kb of image library weighing us down" is just plain silly.